If the lines and are concurrent, then the value of is.
Explanation for the correct option:
Step 1: Find the point of intersection of lines given by the pair of straight lines.
In the question, a pair of straight lines is given.
We know that, if a pair of straight lines , then the point of intersection of lines is given by .
On comparing both the equations we get and .
So, the point of intersection of lines given by can be given as follows:
Therefore, the point of intersection of lines given by the equation of pair of straight lines is .
Step 2: Find the value of .
Since the lines and are concurrent and the point of intersection of lines given by the equation of pair of straight lines is .
So, the line also satisfy .
That is,
Therefore, the value of is .
Hence, option (D) is the correct answer.